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  <script>
    var arr = [2, 6, 1, 77, 52, 25, 7];
    var max = arr[0];
    for (var i = 1; i < arr.length; i++) {
      if (arr[i] > max) {
        max = arr[i];
      }
    }
    console.log('该数组里面的最大值为：' + max);
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